Which of the Following Would Prevent a Physician from Performing

Multiple Choice

Which of the following would prevent a physician from performing bronchoscopy?
1) PaO₂ of 45 mm Hg
2) International normalized ratio (INR) of 4.5
3) PaCO₂ of 38 mm Hg
4) Current heart rate of 120 beats/min and rhythm of atrial fibrillation

A) 1 and 2
B) 3 and 4
C) 1, 2, and 4
D) 2, 3, and 4